Air purifier



1. Air purifier

1.1 is a perspective view of an air purifier, showing our new design;

1.2 is a front elevation view thereof;

1.3 is a rear elevation view thereof;

1.4 is a left-side elevation view thereof;

1.5 is a right-side elevation view thereof;

1.6 is a top plan view thereof;

1.7 is a bottom plan view thereof; and

1.8 is another top plan view thereof, showing an example of a display part being activated.

The broken line showing of portions of the air purifier is for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 